Clearwire International, LLC, an operating subsidiary of Clearwire Corporation (NASDAQ: CLWR), and Aicent Inc. (www.aicent.com) today announced an important step forward for international WiMAX roaming following the successful completion of the first inter-network roaming connection between WiMAX networks.

The demonstration, which enabled a USB modem and a CLEAR™ 4G WiMAX service username and password to gain access to a WiMAX network in Taiwan, shows the ease with which a CLEAR 4G WiMAX user could gain access to a non-CLEAR network abroad using Aicent’s WiMAX Roaming eXchange (WRX).

“The future promise of WiMAX stretches beyond national borders to offer mobile data users the ability to connect wirelessly, at broadband speeds, wherever they may travel across the globe,” said Ali Tabassi, Clearwire’s senior vice president of Global Ecosystem and Standards. “The ability of WiMAX operators to work cooperatively in order to create seamless, simple and reliable international interoperability, as we have successfully demonstrated through Aicent’s facilities, will be crucial to realizing the tremendous social and economic potential of a truly connected world.”

“The entire communications industry stands on the precipice of immense change,” said Lynn Liu, president and CEO of Aicent. “People are traveling with great ease and more often than not bringing with them devices that need to connect to networks. There are important technical challenges to overcome to enable people to have ‘anywhere, anytime access’ to these important, often critical, data networking connections. Aicent is fortunate to work with leaders like Clearwire to bring the innovations that will ultimately result in a worldwide ubiquitous WiMAX network.”

WiMAX has emerged as a key technology to support true 4G connectivity for both fixed wireless and mobile. Available spectrum in countries has been allocated to WiMAX and hundreds of new wireless operators are delivering services alongside traditional wireless operators. Today there are a growing number of devices supporting multiple radios for multimode WiMAX, WiMAX+Wi-Fi, WiMAX+EVDO and WiMAX+HSPA in the market. Aicent is already working with many CDMA, GSM, Wi-Fi and WiMAX operators to bring global and inter-standard roaming into commercial reality.

About Clearwire International Clearwire International, LLC, an operating subsidiary of Clearwire Corporation (NASDAQ: CLWR), offers a robust suite of advanced high-speed Internet services to consumers and businesses. As part of a multi-year network build-out plan, Clearwire’s 4G service, called CLEAR(TM), will be available in major metropolitan areas across the U.S., and bring together an unprecedented combination of speed and mobility. Clearwire’s open all-IP network, combined with significant spectrum holdings, provides unmatched network capacity to deliver next generation broadband access. Strategic investors include Intel Capital, Comcast, Sprint, Google, Time Warner Cable, and Bright House Networks. Clearwire currently provides 4G service, utilizing WiMAX technology, in 16 markets and provides pre-WiMAX communications services in 40 markets across the U.S. and Europe. Headquartered in Kirkland, Wash., additional information about Clearwire is available at www.clearwire.com.

About Aicent, Inc. Serving more than one billion mobile users around the world, Aicent Inc. is a leading provider of data network services and solutions for global mobile operators. To enable interoperability between Aicent customers and other networks, Aicent operates one of the world’s largest GPRS and 3G network exchanges, connecting to over 50 operators, including four of the world’s five largest. Through extensive peering arrangements, the Aicent network reaches nearly all GPRS/3G operators around the world. Aicent also operates integrated mobile messaging services, including one of the world’s first and largest multimedia messaging exchanges, and offers other value-added services to help carriers maximize revenue opportunities. Founded in 2000 and headquartered in San Jose, Calif., Aicent has regional offices in the Americas, Asia Pacific and Europe. For more information, please visit: www.aicent.com.

Cautionary Statement Regarding Forward-Looking Statements This press release contains “forward-looking statements” within the meaning of the securities laws. The statements in this release regarding plans for the development and deployment of the first nationwide next-generation wireless broadband network based on mobile WiMAX technology; the timing, availability, capabilities and coverage of our network, including market launch plans; products and services to be offered on our network; planned marketing and branding efforts and other statements that are not historical facts are forward-looking statements. The words “will,” “would,” “may,” “should,” “estimate,” “project,” “forecast,” “intend,” “expect,” “believe,” “target,” “designed,” “plan” and similar expressions are intended to identify forward-looking statements. Forward-looking statements are projections reflecting management’s judgment and assumptions based on currently available information and involve a number of risks and uncertainties that could cause actual results to differ materially from those suggested by the forward-looking statements. Future performance cannot be assured. Actual results may differ materially from those in the forward-looking statements due to a variety of factors, including, but not limited to, the risks referenced in the section of Clearwire’s Quarterly Report on Form 10-Q entitled “Risk Factors,” filed August 13, 2009. Clearwire believes the forward-looking statements in this release are reasonable; however, you should not place undue reliance on forward-looking statements, which are based on current expectations and speak only as of the date of this release. Clearwire is not obligated to publicly release any revisions to forward-looking statements to reflect events after the date of this release.